Lightweight targeted compression without reducing your mobility. Recommended for Arthritis, Bursitis, Chondromalacia, Jumper’s Knee, Osgood-Schlatter’s Disease, Patellofemoral Syndrome, Iliotibial Band Syndrome, Runner’s Knee, Subluxating Kneecap, Patellar Tendonitis, and Misalignment of the Quadriceps. Sizing: Measure around center of knee. Small/Medium: 9 - 12 in Large/XL: 12 - 18 in One Size - 12 - 18 in